NUP-2306 Call Region.purgeInputLinkBufferHeads after compute() calls in CLAModel to integrate with the new delayed link implementation from nupic.core.
NUP-2306 Call Region.purgeInputLinkBufferHeads after compute() calls in CLAModel to integrate with the new delayed link implementation from nupic.core.

ywcui1990/nupic,neuroidss/nupic,pulinagrawal/nupic,scottpurdy/nupic,alfonsokim/nupic,rhyolight/nupic,EricSB/nupic,scottpurdy/nupic,pulinagrawal/nupic,EricSB/nupic,marionleborgne/nupic,numenta/nupic,vitaly-krugl/nupic,subutai/nupic,EricSB/nupic,rcrowder/nupic,rhyolight/nupic,numenta/nupic,numenta/nupic,rcrowder/nupic,pulinagrawal/nupic,ywcui1990/nupic,lscheinkman/nupic,scottpurdy/nupic,neuroidss/nupic,marionleborgne/nupic,alfonsokim/nupic,alfonsokim/nupic,arhik/nupic,rcrowder/nupic,ywcui1990/nupic,lscheinkman/nupic,arhik/nupic,subutai/nupic,subutai/nupic,lscheinkman/nupic,rhyolight/nupic,arhik/nupic,vitaly-krugl/nupic,marionleborgne/nupic,vitaly-krugl/nupic,neuroidss/nupic